Library for a filter DSL in python
選択できるのは25トピックまでです。 トピックは、先頭が英数字で、英数字とダッシュ('-')を使用した35文字以内のものにしてください。
Johann Schmitz a663b37473
Updated to include pyparsing as a dependency
src/phylter Fixed a bug where a string value would not be unqouted 4年前
tests Fixed a bug where a string value would not be unqouted 4年前
.gitignore Initial code commit 4年前
.travis.yml Updated .travis.yml 4年前
LICENSE.txt Initial commit 4年前
Makefile Initial commit 4年前 Updated README 4年前
requirements.txt Initial code commit 4年前
requirements_dev.txt Initial commit 4年前
requirements_optional.txt Added DjangoBackend, refactored other code 4年前 Updated to include pyparsing as a dependency 4年前


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phylter is a mini-dsl filter language. You can use it to allow users to write there own filters without letting them access your database directly (and thus, need to understand your database layout).


The language implements the following operators: == (equals), > (greater than), < (less than), >= (greater than or equals), <= (less than or equals) and the two operators and and or.

The precende of the and and or operator follows the python operator precedence.

Basic usage

from phylter import parser

parser = parser.Parser()
query = parser.parse("foo == 'bar'")


The query is passed as string to a Parser instance which builds a Query object. The apply method applies the query to the passed iterable using the most appropiate backend (see below).


The Query's apply method decides the best backend to use based on the type of the passed iterable. As a fallback, the ObjectsBackend will be used.

The most universal backend is the ObjectsBackend. This backend applies the query to standard python objects.

The DjangoBackend will be used if the iterable argument of the apply method is a Django QuerySet or Manager instance. The DjangoBackend translates the Query object into a Django database query:

class Person(models.Model):
    first_name = models.CharField(...)
    last_name = models.CharField(...)
    age = models.PositiveIntegerField(...)

query = Parser().parse("first_name == 'Alice')   

will result in a Django query roughly equivalent to


and a query like first_name == 'Bob' or age > 20 in

Person.objects.filter(Q(first_name='Bob') | Q(age__gt=20))